Multiple fuse plug



Nov. 22, 1938. w. sKoJEc MULTIFLE FUSE PLUG Filed Feb. 28. l938 23 h/zZ/z'a/W Jim/'60 ATTOPNEYS Patented Nov. 22, 1 938 UNITED STATES ala-7,593

PATENT OFFICE MUL'rrrLE rUsE PLUG ton, N. Y.

Application February 28, 1938, Serial No. 193,139

3 claims.

This invention relates to multiple fuse plugs and has foran object to provide a fuse plug having a cylindrical magazine containing a plurality of dished fuses adapted to be successively fed into engagement with, and connect the terminals of the plugin series, when a fuse burns out.

A further object of the invention is to provide a multiplefuse plug which may be conveniently operated by persons unskilled in the electrical art and which will be formed of a few strong simple and durable parts, which will be inexpensively manufactured, and which will not easily get out of order.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a front elevation of a multiple fuse plug constructed in accordance with the invention and showing a pair of fuse magazines disposed on the sides of the plug.

Figure 2 is a side elevation of the plug shown in Figure 1.

Figure 3 is an enlarged plan view of the fuse plug shown in Figure 1.

Figure 4 is a cross sectional view of the fuse plug taken on the line 4-4 of Figure 2.

Figure 5 is a plan view of one of the fuses.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, Ill designates the body of the plug the same having a pair of conventional prongs li and conventional spring contacts l2. Each prong and the respective spring contact are insulated from each other by insulation l3 and are secured together as a unit by a rivet l4.

A contact screw |5 is connected to each prong inside of the plug body and a contact bolt i6 is connected to each spring contact inside of the plug body.

A pair of cylindrical magazines ll are disposed on opposite sides of the plug body and are secured to the plug body by the bolts |5 and IB Which bolts also form circuit terminals. A conductor wire IB` is connected to the bolt IG of the spring contact |2 and is trained longitudinally of the casing and terminally connected to a screw i! which is disposed in the magazine diametrically opposite the head of the bolt i5 carried by the prong ll.

A plurality of dished fuses 20 are arranged in a stack in the magazine and are separated by insulating washers 21. The uppermost fuse bridges the heads of the bolt l5 and screw IB. The lowermost fuse is supported upon the swivel head 22 of a feed screw 23 which is threadedly engaged in a plug 24 of insulating material which closes the lower end of the magazine.

As best shown in Figure 5 each fuse is provided with oppositely disposed grooves 25 which receive longitudinal guide ribs 26 formed on the inner wall of the magazine.

Each prongv ll is connected in series with its respective spring contact l2 through the instrumentality of the bolt 15, fuse 2'0, screw l9, conductor wire l8 and bolt IG. When a fuse burns out it is simply necessary to feed the stack upwardly by turning the feed screw 23 until the next lowermost fuse, is forced into bridging contact with the head of the bolt |5 and head of the screw l9. The dished shape of the fuse assures gcod electrical contact.

From the above description it is thought that the construction and Operation of the invention will be fully understood without further explana-' tion.

What is claimed is:

1. A multiple fuse comprising a body, a cylindrical magazine, screws connecting the magazine to the body and forming circuit terminals, a stack of dished fuses in said cylinder, a circuit terminal in the cylinder disposed opposite one of the first named 'screws and electrically connected to the other of the first named screws, and a feed screw carried by the cylinder for feeding the fuses selectively into circuit closing position between the circuit terminal in the cylinder and the first named screw.

2. A multiple fuse comprising a body, a cylindrical magazine, screws connecting the magazine to the body and forming circuit terminals, a stack of dished fuses in said cylinder, a circuit terminal in the cylinder disposed opposite one of the first named screws and electrically connected to the other of the first named screws, a feed screw carried by the cylinder for feeding the fuses selectively into circuit closing position between the circuit terminal in the cylinder and the first named screw, said fuses being insulated from each other and being provided at opposite points with guide grooves, and guide ribs in the cylinder projecting into said guide grooves.

2 mamma posed in circuit cloeing poeition between the other of said circuit terminnle and the circuit terminal in the magazine, end meenl for ieedinc the tusen mcceseively into circuit closing position when the first named iuee ie burned out. 

